| 摘要 |
Disclosed is a structure of a set screwdriver having a subminiature nib to tighten or loosen a subminiature screw used for jewelry or high-priced articles. A rotating cap which is the uppermost part of the screw driver has a body insertion part which is formed at the lower part and has an annular stepped jaw and an annular protrusion. A main body which is a hand grip of the screw driver has three spaces formed in the circular direction, a hexagonal external shape on the plane, a vertex which is formed at the lower part and is suddenly narrowed, finger wings formed integrally with both sides of the outside of the vertex to allow a user to grasp them with the thumb and the index finger, and a connection rod which is connected to the middle of the vertex in a vertical direction and has a hexagonal hole to allow the user to connect or separate a kit. Four kits for tightening or loosening a screw form one set and have the same length, and each of the kits includes a hexagonal shaft which is a body of the kit, a small recess formed in one side thereof and a spring mounted on the small recess to elastically act a subminiature ball. The shaft has four kits having a ′-′-shaped nib formed at one side and a ′+′-shaped nib formed at the other side, wherein one kit is always connected to the connection rod and the other three kits are stored in the three respective spaces, such that the kits can be replaced according to standards of the screw and allow the user to focus force with the thumb and the index finger. |
